diff --git a/src/controllers/api/timelines.ts b/src/controllers/api/timelines.ts
index 40b54c93..27459a82 100644
--- a/src/controllers/api/timelines.ts
+++ b/src/controllers/api/timelines.ts
@@ -37,7 +37,7 @@ const publicTimelineController: AppController = (c) => {
 };
 
 const hashtagTimelineController: AppController = (c) => {
-  const hashtag = c.req.param('hashtag')!;
+  const hashtag = c.req.param('hashtag')!.toLowerCase();
   const params = paginationSchema.parse(c.req.query());
   return renderStatuses(c, [{ kinds: [1], '#t': [hashtag], ...params }]);
 };